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-9=-(5-a)
We move all terms to the left:
-9-(-(5-a))=0
We add all the numbers together, and all the variables
-(-(-1a+5))-9=0
We calculate terms in parentheses: -(-(-1a+5)), so:We get rid of parentheses
-(-1a+5)
We get rid of parentheses
1a-5
We add all the numbers together, and all the variables
a-5
Back to the equation:
-(a-5)
-a+5-9=0
We add all the numbers together, and all the variables
-1a-4=0
We move all terms containing a to the left, all other terms to the right
-a=4
a=4/-1
a=-4
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